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They do recognize them, and they are very familiar with the grading system. You will not be at a disadvantage, because a lot of American schools offer the IB program. What really matters are your grade (more importantly, your class rank), and your SAT scores. However, you will be at a disadvantage if you are a international applicant, because their applicant pool is very competitive.

maximum scholars who're admitted to Ivies don't have IB diplomas and having an IB degree is not extra useful for Ivy admission than having a minimum of ten AP instructions with precise grades. The Ivies do no longer anticipate scholars to take instructions or to earn diplomas that are actually not offered at their extreme colleges.